dr man page on 4.4BSD

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DR(4)		      BSD/tahoe Kernel Interfaces Manual		 DR(4)

NAME
     dr — Ikon DR-11W interface

SYNOPSIS
     device dr0 at vba? csr 0xffff8000 vector drintr

DESCRIPTION
     The dr driver provides access to an Ikon DR-11W DMA controller.  Each
     minor device is a different controller.

     In addition to reading and writing, the following ioctl(2) requests are
     available:

     DRWAIT	    Wait for an attention interrupt from the associated
		    device.

     DRPIOW	    Write to the programmed I/O register.

     DRPACL	    Write to the pulse register.

     DRDACL	    Set the ``ac-low'' bit in the next command sent to the
		    DR-11W.

     DRPCYL	    Set the ``cycle'' bit in the next command sent to the
		    DR-11W.

     DRDFCN	    Hold the function bits until the next command is issused.

     DRRATN	    Reset the attention flag.

     DRRDMA	    Reset the DMA complete flag.

     DRSFCN	    Set the function bits in the control status register and,
		    as a side effect, clear the interrupt enable flag.

     DRRPER	    Reset the parity error flag.

     DRSETRSTALL    Set ``no stall'' mode for all subsequent reads.  In no
		    stall mode the driver will abort read requests that fail
		    to complete before a user specified timeout expires.

     DRSETNORSTALL  Disable no stall mode for reads.

     DRGETRSTALL    Return true if in no stall mode for reads.

     DRSETRTIMEOUT  Set the value of the timeout used in no stall mode	for
		    reads.  The time is specified in tenths of seconds.

     DRGETRTIMEOUT  Return the time until (in tenths of seconds) before a read
		    is timed out when in no stall mode.

     DRSETWSTALL    Set ``no stall'' mode for all subsequent writes.  In no
		    stall mode the driver will abort write requests that fail
		    to complete before a user specified timeout expires.

     DRSETNOWSTALL  Disable no stall mode for writes.

     DRGETWSTALL    Return true if in no stall mode for writes.

     DRSETWTIMEOUT  Set the value of the timeout used in no stall mode	for
		    writes.  The time is specified in tenths of seconds.

     DRGETRTIMEOUT  Return the time until (in tenths of seconds) before a
		    write is timed out when in no stall mode.

     DRWRITEREADY   Return 1 if the device can accept data, 0 otherwise (this
		    is really the DR-11W A status bit).

     DRREADREADY    Return 1 if the device has data for the host to read, 0
		    otherwise (this is really the DR-11W B status bit).

     DRBUSY	    Return 1  if the device is busy, 0 otherwise.

     DRRESET	    Reset the DR-11W.

     DR11STAT	    Return the driver status and the contents of the DR-11W
		    I/O registers. The eight words returned are, in order, the
		    driver status flags, the contents of the control status
		    register, the contents of the status register at the time
		    of the last interrupt from the device, the contents of the
		    programmed I/O data register, a combination of the address
		    modifier used by the device in performing VERSAbus trans‐
		    fers and the interrupt vector used by the device, the con‐
		    tents of the range register, the contents of the rahi reg‐
		    ister, and the contents of the ralo register.

     DR11LOOP	    Perform loopback testing (the loopback cable must be in
		    place for this to work).

FILES
     /dev/dr[0-7]    standard devices

DIAGNOSTICS
     Lots of them, none of them meaningful.

HISTORY
     The dr driver appeared in 4.3BSD-Tahoe.

BUGS
     This driver needs to be rewritten.

4.2 Berkeley Distribution	 June 5, 1993	     4.2 Berkeley Distribution
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